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Updated Pics and some more detail: The only area that had the factory wax blown off was where the high pressure car wash could directly hit the frame, just under the rockers. I went under the truck and checked everything else - the underside was surprisingly well coated with FF. It "stayed" decently. I sprayed another pint of FF on the exposed frame and more of the underbody. If you look at the pic I posted earlier the bare metal was beading water. What is interesting about this is that the FF was applied over the waxy factory undercoating. This waxy undercoating was blown off by high pressure car washing yet the water was beading on the bare metal. This means that the FF did wick its way to the metal and was protecting it somewhat. This 2016 GM truck had rust on most of the welds and most sharp edges. It spent one winter in the NE with heavily salted roads. The weld rust is due to having really shitty wax undercoating from the factory that is pretty easily removed by normal washing and harsh winter conditions. Yes, welds rust. These rusty areas have not grown since application of FF. So I think that FF does work but it will need to be re-applied. Mostly it makes me feel like I have done something to protect the truck against the horrible salty roads. We will see in about a year how it looks.

2016 Silverado + Fluid Film application about a month ago + a few car washes + a few days of salted snowy roads. It definitely softens the factory 2016 undercoating. I am going to apply in those spots again.